"in other words"
この人は私の妻のお母さんです。即ち、 {義理|ぎり}の母です。 This person is my wife's mother. In other words, she is my mother-in-law.
僕は肉を食べない。すなわち菜食主義者だ。 I don't eat meat. I other words, I'm a vegetarian.
5割引きの商品とは、すなわち元の値段の 半額ということだ。 items at 50% of are in other words things that are half the price of the original price.